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Research Activities > Programs > Electromagnetic Metamaterials

Electromagnetic Metamaterials and their Approximations:
Practical and Theoretical Aspects

CSIC Building (#406), Seminar Room 4122.
Directions: home.cscamm.umd.edu/directions

Transformation Media for the Extreme Control of Light

Professor Alexander Kildishev

Purdue University

Abstract:   The presented overview is focused on optical metamaterials designed for extreme control over the flow of light at both the nano- and macroscopic scales. These extreme metamaterials incorporate the innovative theories of transformation optics (TO), and hyperlens and are pertinent to the important areas of optical cloaking, sub-wavelength sensing, super-resolution imaging, and magnifying hyperlens. Increasing attention has been applied to creating an electromagnetic cloak of invisibility based on various schemes, including dipolar scattering cancellation and TO, but practical applications of TO go far beyond just cloaking. The TO theory, built on fundamental variational principles allows the control of light in an extreme and ultimate manner by providing a general recipe for obtaining complex spatial distributions of anisotropic permittivity and permeability.

Using these distributions, a curvilinear optical space is made, creating the channel for the desired flow of light. Extreme control of light requires extreme optical properties, which can be gained only in the sub-wavelength-scale composition of dispersive and non-dispersive materials. The adaptive algorithms based on stochastic optimization techniques, providing ultimate metamaterial designs, are an instrumental part of our on-going studies.

In the talk the emphasis is made on complex physical phenomena at the interfaces and inside the dispersive elements, i.e. size- and surface effects and the effect of structural disorders in highly-anisotropic materials, which should be incorporated into the computational models for the ultimate design of the extreme metamaterials.

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